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中国科学院昆明植物研究所知识管理系统
Knowledge Management System of Kunming Institute of Botany,CAS
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GST,p < 0.001) and low levels of seed-based gene flow. C. debaoensis (Cycadaceae) is an endangered species restricted to the border of Guangxi and Yunnan province in southwest China. This species has been classified into two types: sand and karst, according to the soil matrix they grow on. We examined chloroplast sequence variation of the cpDNA sequences from 11 populations of this species. Significant population genetic differentiation was detected (GST= 0.684 and FST = 0.74160). There was marked genetic differentiation between populations in the sand and karst regions and no expansion was detected. Climate changes during glacial periods have had significant effects on the current distribution of cycads. The molecular phylogenetic data, together with the geographic distribution of the haplotypes, suggest that C. debaoensis experienced range contraction during glacial periods, and that the current populations are still confined to the original refugia in southwest China which have favorable habitats in glacial period. These results imply that small refugia were maintained in both sand and karst regions during the LGM (last glacial maximum). This species had no postglacial recolonization and only stayed in these refugia up to now. The low within-population diversity of C. debaoensis suggests that there were strong bottleneck events or founder effects within each separate region during the Quaternary climatic oscillations. Relatively high genetic and haplotype diversities were detected in the newly discovered populations, which located at intermediate locality of sand regions and had morphological variation; this is probably the consequence of the admixture of different haplotypes colonizing the area from separate sources. C. micholitzii occurs in the Annan Highlands in central Vietnam near the Laos border. C. bifida occurs in North Vietnam; its distribution extends across the border into adjacent localities in Guangxi and Yunnan in China. For the comparability between them,theywere considered as the same species C. micholitzii by many academicians. The cpDNA sequences from 11 populations showed that these very controversial species, C. micholitzii and C. bifida, is paraphyletic and should belong to the same species C. micholitzii. AMOVA analysis showed that the component of among-population within region/species (76.46%) was unexpectedly larger than the among-species/region component (14.97%), which also indicates that there is no justification for recognizing two species as C. micholitzii and C. bifida. This hypothesis was also supported by the geological data, especially the neotectonic history of the indo-china block, which started to move south since Oligocene and cause the geographic isolation of these two groups. Therefore, the most likely explanation to the phenotypic similarities between these two groups may be the retention of ancestral polymorphisms in the paraphyletic group due to incomplete lineage sorting. Furthermore, the similarities may also be ascribed to pollen-mediated gene flow among geographically proximate populations and/or phenotypic convergence under similar selection schemes in the same region. C.micholitzi had the higest genetic diversity (HT = 0.980,) and genetic differentiation (GST = 0.830, NST = 0.915) among the C. micholitzii complex. The high genetic diversity might be attributed to its long evolutionary history, highly diverse habitats. The ineffective mode of seed dispersal and dramatic neotectonic movement in the distribution range of this species could result in the high genetic differentiation. 2. Phylogeographic analysis based on nuclear ribosomal sequences, We sequenced the nrDNA ITS in all 27 populations sampled, 7 haplotypes were identified, among which C. micholitzii had 6, while C. multipinnata, C. longipetiolula and C. debaoensis shared the remaining one. Compared to chloroplast genes, nuclear genes had higher correlation between genetic and geographical distance, but lower interspecies differentiation (54.42% vs 25.24%). Phylogeographical structure of C. micholitzii and C.bifida based on ITS Variation was consistent with the morphology differentiation. This similar in nuclear gene should be ascribed to pollen-mediated gene flow among geographically proximate populations.Long-distance gene flow over the two groups was clearly interrupted, which brought on the nrDNA genetic differenciation between the geographically isolated groups, to a certain extent affected the morphological variation. 3. Interspecies relationships among Cycas micholitzii complex, We analysed chloroplast sequence variation of the atpB-rbcL and psbA-trnH intergenic spacers in 27 populations sampled of C. micholitzii complex, AMOVA analysis showed that the component of among-species/region component (59.21%). However, phylogenic analysis showed that the haplotypes of C. micholitzii complex couldn`t grouped into four clusters closely corresponding to the narrowly defined C. micholitzi, C. multipinnata, C. debaoensis and C. longipetiolula. We concluded that the conflict may result from several factors: firstly incomplete lineage sorting of C. micholitzii; secondly hybridization/introgression of sympatrically cycads, which would be supported by evidence base on nrDNA ITS sequences; thirdly intramolecular recombination in cpDNA of cycads; eventually the neotectonic movement in the distribution range of this 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HANDBOOKOF BIOLOGICAL STATISTICS
期刊论文
出版物, 3111, 期号: 0, 页码: 1-291
作者:
JOHN H. MCDONALD
Adobe PDF(1363Kb)
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浏览/下载：235/2
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提交时间：2017/07/24
Preface
期刊论文
出版物, 3111, 期号: 0, 页码: 3—14
作者:
E. A. C. Lucken
;
A larich Weiss
Adobe PDF(10565Kb)
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浏览/下载：146/1
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提交时间：2017/07/24
Effector-triggered immunity by the plantpathogen Phytophthora
期刊论文
TRENDS in Microbiology, 3111, 卷号: 14, 期号: 11, 页码: 470-473
作者:
Dinah Qutob
;
Jennifer Tedman-Jones
;
Mark Gijzen
Adobe PDF(152Kb)
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浏览/下载：126/2
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提交时间：2017/07/24
Evolutionary ecology of plant-plant interactions
期刊论文
出版物, 3111, 页码: 1-144
作者:
Zuo Z(作者)
Adobe PDF(717Kb)
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浏览/下载：224/4
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提交时间：2017/07/19
JATROPHA CURCAS L.AN INTERNATIONAL BOTANICAL ANSWER TOBIODIESEL PRODUCTION & RENEWABLE ENERGY
期刊论文
出版物, 3111, 期号: 0, 页码: 1—65
作者:
Zuo Z(作者)
Adobe PDF(2342Kb)
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浏览/下载：146/1
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提交时间：2017/07/24
Data Analysisin Vegetation Ecology
期刊论文
出版物, 3111, 期号: 0, 页码: 1-297
作者:
Otto Wildi
Adobe PDF(3432Kb)
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浏览/下载：140/2
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提交时间：2017/07/24
Deciphering complex reticulate evolution of Asian Buddleja (Scrophulariaceae): insights into the taxonomy and speciation of polyploid taxa in the Sino-Himalayan region
期刊论文
ANNALS OF BOTANY, 2023
作者:
Yang,Fengmao
;
Ge,Jia
;
Guo,Yongjie
;
Olmstead,Richard
;
Sun,Weibang
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Adobe PDF(2981Kb)
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浏览/下载：0/0
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提交时间：2024/05/09
Buddleja
phylogenomics
reticulate evolution
polyploidy
plastid genome
low-copy nuclear gene
HYBRIDIZATION
ALIGNMENT
DIVERSIFICATION
ALLOPOLYPLOIDY
PHYLOGENETICS
FRAMEWORK
NUCLEAR
ROBUST
FLOW
Plastome evolution in the East Asian lobelias (Lobelioideae) using phylogenomic and comparative analyses
期刊论文
FRONTIERS IN PLANT SCIENCE, 2023, 卷号: 14, 页码: 1144406
作者:
Li,Chun-Jiao
;
Xie,Xin-Tong
;
Liu,Hong-Xin
;
Wang,Ruo-Nan
;
Li,De-Zhu
Adobe PDF(6416Kb)
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浏览/下载：1/0
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提交时间：2024/05/09
East Asian lobelias
plastomes
phylogenomic framework
highly divergent regions
positive selection
adaptive evolution
INVERTED REPEAT
HIGH-ALTITUDE
CAMPANULACEAE
GENOMES
SELECTION
EXPANSION
SEQUENCE
TOOLS
GENE
DNA
Phylotranscriptomic analyses reveal multiple whole-genome duplication events, the history of diversification and adaptations in the Araceae
期刊论文
ANNALS OF BOTANY, 2022
作者:
Zhao, Lei
;
Yang, Ying-Ying
;
Qu, Xiao-Jian
;
Ma, Hong
;
Hu, Yi
;
Li, Hong-Tao
;
Yi, Ting-Shuang
;
Li, De-Zhu
Adobe PDF(1678Kb)
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浏览/下载：4/0
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提交时间：2024/04/30
Araceae
diversification
phylogenomics
WGDs
adaptation
TRAIT-DEPENDENT SPECIATION
GENE DUPLICATION
ANGIOSPERM DIVERSIFICATION
PHYLOGENOMIC ANALYSES
NUCLEAR GENES
POLYPLOIDY
EVOLUTIONARY
FAMILY
RATES
TOOL
蓖麻化成生和子理究矮化形成的生理和分子机理研究
学位论文
, 2021
作者:
王再青
Adobe PDF(6734Kb)
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浏览/下载：625/1
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提交时间：2023/11/02
